1 A question tag is a short question following a statement:
This coffee is nice, isn’t it?
You can play the piano, can’t you?
2 We ask a question in this way to confirm something that we are already quite sure of:
You’re from Sweden, aren’t you?
(We’re quite sure the person is from Sweden, but we wish to confirm it)
3 A positive question tag follows a negative statement. A negative question tag follows a positive statement:
You like cheese, don’t you?
You don’t like cheese, do you?
4 We can use question tags with any tense and with modal verbs. Here are some examples:
You eat here often, don’t you?
He is happy, isn’t he?
Present Continuous Tense:
She is skipping, isn’t she?
You have been there before, haven’t you?
You ate it, didn’t you?
You were sitting there, weren’t you?
You had seen it, hadn’t you?
You will come, won’t you?
You will be coming, won’t you?
You are going to come, aren’t you?
They are made in Japan, aren’t they?
It should be fine, shouldn’t it?
He couldn’t come, could he?